/** * swap the server connection with a connection from * the connection pool * * we can only switch backends if we have a authed connection in the pool. * * @return NULL if swapping failed * the new backend on success */ network_socket *network_connection_pool_lua_swap(network_mysqld_con *con, int backend_ndx, GHashTable *pwd_table) { network_backend_t *backend = NULL; network_socket *send_sock; network_mysqld_con_lua_t *st = con->plugin_con_state; // GString empty_username = { "", 0, 0 }; /* * we can only change to another backend if the backend is already * in the connection pool and connected */ backend = network_backends_get(con->srv->backends, backend_ndx); if (!backend) return NULL; /** * get a connection from the pool which matches our basic requirements * - username has to match * - default_db should match */ #ifdef DEBUG_CONN_POOL g_debug("%s: (swap) check if we have a connection for this user in the pool '%s'", G_STRLOC, con->client->response ? con->client->response->username->str: "empty_user"); #endif int flag = 0; network_connection_pool* pool = chassis_event_thread_pool(backend); if (NULL == (send_sock = network_connection_pool_get(pool))) { /** * no connections in the pool */ flag = 1; if (NULL == (send_sock = self_connect(con, backend, pwd_table))) { st->backend_ndx = -1; return NULL; } } /* the backend is up and cool, take and move the current backend into the pool */ #ifdef DEBUG_CONN_POOL g_debug("%s: (swap) added the previous connection to the pool", G_STRLOC); #endif // network_connection_pool_lua_add_connection(con); /* connect to the new backend */ st->backend = backend; // st->backend->connected_clients++; st->backend_ndx = backend_ndx; if (flag == 0 && !g_atomic_int_compare_and_exchange(&st->backend->connected_clients, 0, 0)) { g_atomic_int_dec_and_test(&st->backend->connected_clients); //g_critical("pool_lua_swap:%08x's connected_clients is %d\n", backend, backend->connected_clients); } return send_sock; }
int backend_load_balance_get(network_mysqld_con* con) { int ret = -1; gint i, load_value, count, flag = 0; double cv, connect_value; network_backend_t* backend; network_connection_pool* pool; if(con->config->max_connections == 0) return ret; network_backends_t* backends = con->srv->priv->backends; count = network_backends_count(backends); load_value = con->config->max_connections; for(i = 0; i < count; i++) { backend = network_backends_get(backends, i); if (backend == NULL) continue; pool = chassis_event_thread_pool(backend); if (pool == NULL) continue; if (backend->type == BACKEND_TYPE_RO && backend->state == BACKEND_STATE_UP && backend->connected_clients >= load_value) { flag = 1; connect_value = backend->connected_clients / (double)backend->weight; break; } } if(flag == 0) return ret; for(i = 0; i < count; i++) { backend = network_backends_get(backends, i); if (backend == NULL) continue; pool = chassis_event_thread_pool(backend); if (pool == NULL) continue; if (backend->type == BACKEND_TYPE_RO && backend->state == BACKEND_STATE_UP) { cv = backend->connected_clients / (double)backend->weight; if(cv <= connect_value) { ret = i; connect_value = cv; } } } return ret; }
/** * move the con->server into connection pool and disconnect the * proxy from its backend */ int network_connection_pool_lua_add_connection(network_mysqld_con *con, int is_write_sql) { network_connection_pool_entry *pool_entry = NULL; network_mysqld_con_lua_t *st = con->plugin_con_state; guint thread_id; /* con-server is already disconnected, got out */ if (!con->server) return 0; /* TODO bug fix */ /* when mysql return unkonw packet, response is null, insert the socket into pool cause segment fault. */ /* ? should init socket->challenge ? */ /* if response is null, conn has not been authed, use an invalid username. */ if(!con->server->response) { g_warning("%s: (remove) remove socket from pool, response is NULL, src is %s, dst is %s", G_STRLOC, con->server->src->name->str, con->server->dst->name->str); con->server->response = network_mysqld_auth_response_new(); g_string_assign_len(con->server->response->username, C("mysql_proxy_invalid_user")); } /* the server connection is still authed */ con->server->is_authed = 1; /* insert the server socket into the connection pool */ if(is_write_sql == 0) { network_connection_pool* pool = chassis_event_thread_pool(st->backend); pool_entry = network_connection_pool_add(pool, con->server); }else { network_connection_pool* pool = chassis_event_thread_secondpool(st->backend); pool_entry = network_connection_pool_time_add(pool, con->server, con); } if (pool_entry) { event_set(&(con->server->event), con->server->fd, EV_READ, network_mysqld_con_idle_handle, pool_entry); chassis_event_add_local(con->srv, &(con->server->event)); /* add a event, but stay in the same thread */ } g_atomic_int_dec_and_test(&(st->backend->connected_clients)); st->backend = NULL; st->backend_ndx = -1; con->server = NULL; thread_id = chassis_event_thread_index_get(); chassis_event_thread_t *thread = g_ptr_array_index(con->srv->threads, thread_id); if(thread->block_con_queue->length) { if (write(thread->con_write_fd, "", 1) != 1) g_message("%s:pipes - write error: %s", G_STRLOC, g_strerror(errno)); } return 0; }
/** * swap the server connection with a connection from * the connection pool * * we can only switch backends if we have a authed connection in the pool. * * @return NULL if swapping failed * the new backend on success */ network_socket *network_connection_pool_lua_swap(network_mysqld_con *con, int backend_ndx) { network_backend_t *backend = NULL; network_socket *send_sock; network_mysqld_con_lua_t *st = con->plugin_con_state; chassis_private *g = con->srv->priv; // GString empty_username = { "", 0, 0 }; /* * we can only change to another backend if the backend is already * in the connection pool and connected */ backend = network_backends_get(g->backends, backend_ndx); if (!backend) return NULL; /** * get a connection from the pool which matches our basic requirements * - username has to match * - default_db should match */ #ifdef DEBUG_CONN_POOL g_debug("%s: (swap) check if we have a connection for this user in the pool '%s'", G_STRLOC, con->client->response ? con->client->response->username->str: "empty_user"); #endif network_connection_pool* pool = chassis_event_thread_pool(backend); if (NULL == (send_sock = network_connection_pool_get(pool))) { /** * no connections in the pool */ if (NULL == (send_sock = self_connect(con, backend))) { st->backend_ndx = -1; return NULL; } } /* the backend is up and cool, take and move the current backend into the pool */ #ifdef DEBUG_CONN_POOL g_debug("%s: (swap) added the previous connection to the pool", G_STRLOC); #endif // network_connection_pool_lua_add_connection(con); /* connect to the new backend */ st->backend = backend; // st->backend->connected_clients++; st->backend_ndx = backend_ndx; return send_sock; }
/** * move the con->server into connection pool and disconnect the * proxy from its backend */ int network_connection_pool_lua_add_connection(network_mysqld_con *con) { network_connection_pool_entry *pool_entry = NULL; network_mysqld_con_lua_t *st = con->plugin_con_state; /* con-server is already disconnected, got out */ if (!con->server) return 0; /* TODO bug fix */ /* when mysql return unkonw packet, response is null, insert the socket into pool cause segment fault. */ /* ? should init socket->challenge ? */ /* if response is null, conn has not been authed, use an invalid username. */ if(!con->server->response) { g_warning("%s: (remove) remove socket from pool, response is NULL, src is %s, dst is %s", G_STRLOC, con->server->src->name->str, con->server->dst->name->str); con->server->response = network_mysqld_auth_response_new(); g_string_assign_len(con->server->response->username, C("mysql_proxy_invalid_user")); } /* the server connection is still authed */ con->server->is_authed = 1; /* insert the server socket into the connection pool */ network_connection_pool* pool = chassis_event_thread_pool(st->backend); pool_entry = network_connection_pool_add(pool, con->server); if (pool_entry) { event_set(&(con->server->event), con->server->fd, EV_READ, network_mysqld_con_idle_handle, pool_entry); chassis_event_add_local(con->srv, &(con->server->event)); /* add a event, but stay in the same thread */ } if (!g_atomic_int_compare_and_exchange(&st->backend->connected_clients, 0, 0)) { g_atomic_int_dec_and_test(&st->backend->connected_clients); //g_critical("add_connection: %08x's connected_clients is %d\n", backend, backend->connected_clients); } // st->backend->connected_clients--; st->backend = NULL; st->backend_ndx = -1; con->server = NULL; return 0; }
int idle_rw(network_mysqld_con* con) { int ret = -1; guint i; network_backends_t* backends = con->srv->priv->backends; guint count = network_backends_count(backends); for (i = 0; i < count; ++i) { network_backend_t* backend = network_backends_get(backends, i); if (backend == NULL) continue; network_connection_pool* pool = chassis_event_thread_pool(backend); if (pool == NULL) continue; if (backend->type == BACKEND_TYPE_RW && backend->state == BACKEND_STATE_UP) { ret = i; break; } } return ret; }
int idle_ro(network_mysqld_con* con) { int max_conns = -1; guint i; network_backends_t* backends = con->srv->priv->backends; guint count = network_backends_count(backends); for(i = 0; i < count; ++i) { network_backend_t* backend = network_backends_get(backends, i); if (backend == NULL) continue; network_connection_pool* pool = chassis_event_thread_pool(backend); if (pool == NULL) continue; if (backend->type == BACKEND_TYPE_RO && backend->state == BACKEND_STATE_UP) { if (max_conns == -1 || backend->connected_clients < max_conns) { max_conns = backend->connected_clients; } } } return max_conns; }
int wrr_ro(network_mysqld_con *con) { guint i, j; network_backends_t* backends = con->srv->priv->backends; g_wrr_poll* rwsplit = backends->global_wrr; guint ndx_num = network_backends_count(backends); if (rwsplit->next_ndx >= ndx_num) rwsplit->next_ndx = 0; gint backend_ndx = backend_load_balance_get(con); if(0 < backend_ndx) return backend_ndx; // set max weight if no init if (rwsplit->max_weight == 0) { for(i = 0; i < ndx_num; ++i) { network_backend_t* backend = network_backends_get(backends, i); if (backend == NULL || backend->state != BACKEND_STATE_UP) continue; if (rwsplit->max_weight < backend->weight) { rwsplit->max_weight = backend->weight; rwsplit->cur_weight = backend->weight; } } } guint max_weight = rwsplit->max_weight; gint cur_weight = rwsplit->cur_weight; guint next_ndx = rwsplit->next_ndx; // get backend index by slave wrr gint ndx = -1; for(i = 0; i < ndx_num; ++i) { network_backend_t* backend = network_backends_get(backends, next_ndx); if (backend == NULL) goto next; network_connection_pool* pool = chassis_event_thread_pool(backend); if (pool == NULL) goto next; if (backend->type == BACKEND_TYPE_RO && backend->weight >= cur_weight) { if(backend->state == BACKEND_STATE_UP) { ndx = next_ndx; }else { for(j = 0; j < ndx_num; ++j) { network_backend_t* b = network_backends_get(backends, j); if(b == NULL) continue; network_connection_pool* p = chassis_event_thread_pool(b); if(p == NULL) continue; if(b->type == BACKEND_TYPE_RO && b->state == BACKEND_STATE_UP) ndx = j; } } } next: if (next_ndx >= ndx_num - 1) { --cur_weight; next_ndx = 0; if (cur_weight <= 0) cur_weight = max_weight; } else { ++next_ndx; } if (ndx != -1) break; } rwsplit->cur_weight = cur_weight; rwsplit->next_ndx = next_ndx; return ndx; }
/** * swap the server connection with a connection from * the connection pool * * we can only switch backends if we have a authed connection in the pool. * * @return NULL if swapping failed * the new backend on success */ network_socket* network_connection_pool_lua_swap(network_mysqld_con *con, int backend_ndx, int need_keep_conn, int *err) { network_backend_t *backend = NULL; network_socket *send_sock; network_connection_pool *pool, *second_pool; network_mysqld_con_lua_t *st = con->plugin_con_state; chassis_private *g = con->srv->priv; /* * we can only change to another backend if the backend is already * in the connection pool and connected */ backend = network_backends_get(g->backends, backend_ndx); if (!backend) return NULL; /** * get a connection from the pool which matches our basic requirements * - username has to match * - default_db should match */ #ifdef DEBUG_CONN_POOL g_debug("%s: (swap) check if we have a connection for this user in the pool '%s'", G_STRLOC, con->client->response ? con->client->response->username->str: "empty_user"); #endif if(need_keep_conn == 0) { pool = chassis_event_thread_pool(backend); send_sock = network_connection_pool_get(pool); if(send_sock == NULL) { second_pool = chassis_event_thread_secondpool(backend); send_sock = network_expiretime_connection_pool_get(second_pool, con); } }else { second_pool = chassis_event_thread_secondpool(backend); send_sock = network_connection_secondpool_get(second_pool, con); if(send_sock == NULL) g_message("%s:the connection need keep, but it's not in the pool now.", G_STRLOC); } if (NULL == send_sock ) { /** * no connections in the pool */ if ((con->config->max_connections <= 0) || (backend->connected_clients < con->config->max_connections)) { if (NULL == (send_sock = self_connect(con, backend))) { st->backend_ndx = -1; return NULL; } } else { st->backend_ndx = -1; *err = -1; return NULL; } } /* the backend is up and cool, take and move the current backend into the pool */ #ifdef DEBUG_CONN_POOL g_debug("%s: (swap) added the previous connection to the pool", G_STRLOC); #endif /* connect to the new backend */ st->backend = backend; g_atomic_int_inc(&(st->backend->connected_clients)); st->backend_ndx = backend_ndx; return send_sock; }